.mobile-nav {
  background: #fff;
  border-bottom: 1px solid #eee;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
  position: relative;
  z-index: 1000;
}
.mobile-header {
  height: 80px;
}
.mobile-logo {
  width: 120px;
  height: 80px;
  background-repeat: no-repeat;
  background-size: contain;
  background-position: center left;
  cursor: pointer;
}
.hamburger {
  width: 30px;
  height: 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: transparent;
  border: none;
  padding: 0;
}
.hamburger span {
  height: 3px;
  background: #000;
  border-radius: 2px;
  transition: 0.3s;
}
.hamburger.open span:nth-child(1) {
  transform: rotate(45deg) translateY(12px)
}
.hamburger.open span:nth-child(2) {
  opacity: 0;
}
.hamburger.open span:nth-child(3) {
  transform: rotate(-45deg) translateY(-13px)
}
.mobile-menu {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  background: white;
}
.mobile-menu.open {
  max-height: 500px;
}
.mobile-menu ul li a {
  display: block;
  padding: 12px 0;
  border-bottom: 1px solid #eee;
  color: #000;
  font-weight: 500;
  text-decoration: none;
}